似乎简单apt-get remove apache2并没有完全删除，apache2因为我在运行时仍然可以在其中一个进程上看到它top。如何apache2在他的 ubuntu 服务器上完全删除？
它确实没有被删除：
~# which apache2
/usr/sbin/apache2
~# whereis apache2
apache2: /usr/sbin/apache2 /etc/apache2 /usr/lib/apache2 /usr/share/apache2 /usr/share/man/man8/apache2.8.gz
但是当我apt-get remove apache2再次这样做时：
# apt-get remove apache2
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package apache2 is not installed, so not removed
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
我已经双启动到 lubuntu（使用 Windows XP）并且每次都被要求输入密码。如何以 root 身份运行所有内容而不再次询问密码？理想情况下，我想运行 nginx，但它有权限被拒绝的问题：
apathetic@ubuntu:~$ service nginx start
Starting nginx: nginx: [alert] could not open error log file: open() "/var/log/nginx/error.log" failed (13: Permission denied)
2012/08/03 20:06:25 [warn] 4762#0: the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /etc/nginx/nginx.conf:1
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
2012/08/03 20:06:25 [emerg] 4762#0: open() "/var/run/nginx.pid" failed (13: Permission denied)
nginx: configuration file /etc/nginx/nginx.conf test failed